The summary climate graph for Alamosa, CO shows a selection of temperature, rainfall and snow minimum, mean and maximum measures over the course of a year. Click on each of the measures in the key to toggle them on and off.
The warmest month in San Luis Valley Regional Airport, Alamosa, Colorado is July with an average high temperature of 83.0°F. The hottest day on record was June 26 1994 when the temperature hit 93.9°F. During January the overnight temperature drops to an average of -1.4°F with the lowest temperature of -42.2°F being recorded on December 8 1978.
The warmest days on record are:
| 26 Jun 1994 | 93.9°F |
| 7 Jun 2010 | 93.9°F |
| 5 Jul 1989 | 93°F |
| 29 Jun 1990 | 93°F |
| 15 Jul 2003 | 93°F |
The warmest months on average were:
| July 2003 | 89.3°F |
| July 2011 | 88.3°F |
| June 2012 | 87.5°F |
| July 2002 | 87.2°F |
| July 2005 | 87°F |
The coldest days on record are:
| 8 Dec 1978 | -42.2°F |
| 19 Jan 1984 | -40°F |
| 31 Jan 1979 | -39.1°F |
| 24 Dec 1990 | -33.2°F |
| 30 Dec 2007 | -33°F |
The coldest months on average were:
| January 1984 | -17.2°F |
| January 1992 | -15.1°F |
| January 1988 | -14°F |
| January 2008 | -13.3°F |
| January 1973 | -11.5°F |
The wettest month in Alamosa, CO is August with an average of 1.3 inches of rain falling on 11 to 12 days. The driest month in Alamosa, CO is January with an average of 0.3 inches of rain falling on 0 to 1 days.
The wettest days on record are:
| 12 August 2005 | 1.1 inches |
| 8 August 1981 | 0.9 inches |
| 11 August 1979 | 0.9 inches |
| 22 August 2001 | 0.8 inches |
| 19 August 1999 | 0.8 inches |
The wettest months on record are:
| August 1993 | 14.7 inches |
| July 1993 | 13.6 inches |
| June 1993 | 12 inches |
| May 1993 | 11.2 inches |
| September 1992 | 10.8 inches |
The driest months on record are:
| January 1981 | 0 inches |
| June 1980 | 0 inches |
| May 1975 | 0 inches |
| October 1983 | 0 inches |
| January 1986 | 0 inches |